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Differentiate cross pollination from self pollination?
Self pollination is where the plant is able to pollinate without another plant. This provides much less variation in the genetics of the species from generation to generation than cross pollination which is where the pollen from one plant is carried to another plant (bees usually do this) and fertilizes the other plant. It creates more genetic diversity because the genes from both plants, which are different, are involved in the forming of the seed, not just the genes from the one self-pollinating plant.--------------------------------------------IMPROVEDSelf pollination is the transfer of pollen from the anther to the stigma of the same flower, another flower on the same plant, or the flower of a plant of the same clone. Cross pollination is the transfer of pollen from the flower of one plant to the flower of a plant having a different genetic constitution.
When a bee lands on a flower some pollen gets stuck to its legs why is this useful to the plant?
This pollen transfer helps in plant reproduction by allowing the bee to transfer pollen from one flower to another, enabling fertilization. This process leads to the formation of seeds and fruits, essential for the plant's reproduction and genetic diversity.
How do you put pollen in a sentence?
"I am allergic to pollen." "You must be sneezing so much because it's pollen season."
What is pollen?
What is pollen?Plants produce microscopic round or oval pollen grains to reproduce. In some species, the plant uses the pollen from its own flowers to fertilize itself. Other types must be cross-pollinated; that is, in order for fertilization to take place and seeds to form, pollen must be transferred from the flower of one plant to that of another plant of the same species. Insects do this job for certain flowering plants, while other plants rely on wind transport; agents that effect pollination are also known as vectors.Pollen is the haploid male gametophyte generation of the plant and is produced in both angiosperms and gymnosperms through the process of meiosis. Pollen is produced in the male cones of gymnosperms and in the anthers of angiosperms.Pollen and allergies.Each spring, summer, and fall, tiny particles are released from trees, weeds, and grasses. These particles, known as pollen, hitch rides on currents of air. Although their mission is to fertilize parts of other plants, many never reach their targets. Instead, they enter human noses and throats, triggering a type of seasonal allergic rhinitis called pollen allergy, which many people know as hay fever or rose fever (depending on the season in which the symptoms occur). Of all the things that can cause an allergy, pollen is one of the most widespread. Many of the foods, drugs, or animals that cause Allergies can be avoided to a great extent; even insects and household dust are escapable. Short of staying indoors when the pollen count is high--and even that may not help--there is no easy way to evade windborne pollen.People with pollen allergies often develop sensitivities to other troublemakers that are present all year, such as dust mites. For these allergy sufferers, the "sneezin' season" has no limit. Year-round airborne allergens cause perennial allergic rhinitis, as distinguished from seasonal allergic rhinitis.The types of pollen that most commonly cause allergic reactions are produced by the plain-looking plants (trees, grasses, and weeds) that do not have showy flowers. These plants manufacture small, light, dry pollen granules that are custom-made for wind transport. Samples of ragweed pollen have been collected 400 miles out at sea and 2 miles high in the air. Because airborne pollen is carried for long distances, it does little good to rid an area of an offending plant--the pollen can drift in from many miles away. In addition, most allergenic pollen comes from plants that produce it in huge quantities. A single ragweed plant can generate a million grains of pollen a day.The chemical makeup of pollen is the basic factor that determines whether it is likely to cause hay fever. For example, pine tree pollen is produced in large amounts by a common tree, which would make it a good candidate for causing allergy. The chemical composition of pine pollen, however, appears to make it less allergenic than other types. Because pine pollen is heavy, it tends to fall straight down and does not scatter. Therefore, it rarely reaches human noses.Among North American plants, weeds are the most prolific producers of allergenic pollen. Ragweed is the major culprit, but others of importance are sagebrush, redroot pigweed, lamb's quarters, Russian thistle (tumbleweed), and English plantain.Grasses and trees, too, are important sources of allergenic pollens. Although more than 1,000 species of grass grow in North America, only a few produce highly allergenic pollen. These include timothy grass, Kentucky bluegrass, Johnson grass, Bermuda grass, redtop grass, orchard grass, and sweet vernal grass. Trees that produce allergenic pollen include oak, ash, elm, hickory, pecan, box elder, and mountain cedar.It is common to hear people say that they are allergic to colorful or scented flowers like roses. In fact, only florists, gardeners, and others who have prolonged, close contact with flowers are likely to become sensitized to pollen from these plants. Most people have little contact with the large, heavy, waxy pollen grains of many flowering plants because this type of pollen is not carried by wind but by insects such as butterflies and bees.When do plants make pollen?One of the most obvious features of pollen allergy is its seasonal nature--people experience it symptoms only when the pollen grains to which they are allergic are in the air. Each plant has a pollinating period that is more or less the same from year to year. Exactly when a plant starts to pollinate seems to depend on the relative length of night and day--and therefore on geographical location--rather than on the weather. (On the other hand, weather conditions during pollination can affect the amount of pollen produced and distributed in a specific year.) Thus, the farther north you go, the later the pollinating period and the later the allergy season.Pollen countsA pollen count, which is familiar to many people from local weather reports, is a measure of how much pollen is in the air. This count represents the concentration of all the pollen (or of one particular type, like ragweed) in the air in a certain area at a specific time. It is expressed in grains of pollen per square meter of air collected over 24 hours. Pollen counts tend to be highest early in the morning on warm, dry, breezy days and lowest during chilly, wet periods. Although a pollen count is an approximate and fluctuating measure, it is useful as a general guide for when it is advisable to stay indoors and avoid contact with the pollen.
How has sexual reproduction in plants evolved to become less dependent on water?
The nonvascular plants and even a few vascular plants like ferns reproduce by having the sperm swim through the external environment. This swimming requires a water film in the external environment, and also requires that the ovum be in a structure close enough to the ground that the sperm can swim to it. Gymnosperms and angiosperms make pollen. Sperm are confined within a pollen grain. So no swimming is required. Wind and animal pollination/dispersal has helped plants a lot. If a plant lives in the water and let a bunch of its gametes loose, they will be dispersed by the water. This is not the case when plants adapt to life on land, if they just let their gametes go they will just fall on the ground, not go anywhere, and therefore have a much lower likelihood of finding another gamete. So, if the plant entices an animal, say a bumblebee, to come to it by offering it some sweet nectar, then plant can attach some of its pollen to the back of animal and it will carry it to a new plant.
What is the process in which pollen from one plant is used?
Pollen that is received from another plant is called pollination. Pollination occurs when insects and animals gather pollen on their bodies and will disperse it while moving around other plants.
Why is it important for wind pollinated plant to produce large amount of pollen?
Because of the greater odds of the pollen finding another flower to pollinate. Insects fly flower to flower therefore pollination is assured. Wind pollination is much more chancy.
Differentiate cross pollination from self pollination?
Self pollination is where the plant is able to pollinate without another plant. This provides much less variation in the genetics of the species from generation to generation than cross pollination which is where the pollen from one plant is carried to another plant (bees usually do this) and fertilizes the other plant. It creates more genetic diversity because the genes from both plants, which are different, are involved in the forming of the seed, not just the genes from the one self-pollinating plant.--------------------------------------------IMPROVEDSelf pollination is the transfer of pollen from the anther to the stigma of the same flower, another flower on the same plant, or the flower of a plant of the same clone. Cross pollination is the transfer of pollen from the flower of one plant to the flower of a plant having a different genetic constitution.
When a bee lands on a flower some pollen gets stuck to its legs why is this useful to the plant?
This pollen transfer helps in plant reproduction by allowing the bee to transfer pollen from one flower to another, enabling fertilization. This process leads to the formation of seeds and fruits, essential for the plant's reproduction and genetic diversity.
What is the role of the flower in the life cycle of a plant?
Pollen. Pollen is what allows plants to reproduce by cross-pollenation, much like male and female in the human species. The pollen is distributed by bees and other insects, or by the wind shaking the flower and releasing pollen to be born to other plants.
Do bees like barberries?
As a rule no. They do visit blackberry flowers and collect pollen and nectar, and in doing so they pollinate the flowers. If they did not do this, you would not get many blackberries, and those you did get would be uneven and small. If a bee happens to find a damaged ripe blackberry it might lick up some of the juice, but that is about as much as you might expect. Pollen and nectar is what they are after.
What is the advantage of seed production to a flowering plant?
If a flowering plant produces seeds as well as pollen, it has a much better chance of propagating. The range of dispersion is increased, so there is more likelihood that the plant will be able to reproduce.
How much coal is required for 1 mw power plant?
3.5 tonns of coal is required for producing 1 mw
How much pollen is there in one anther?
The amount of pollen in one anther can vary widely depending on the plant species. Typically, an anther can produce thousands to millions of pollen grains. For example, a single anther of certain flowering plants can contain anywhere from 1,000 to over 100,000 pollen grains. This high production is essential for successful pollination and reproduction.
How much pollen can a bee hold?
alot.There is a uncountable amount of pollen.
How do hummingbird pollinate flowers?
birds do not pollinate flowers as they do not sit on a flower and if they sit on flowers then also they don't have so much thin legs that they can pick pollens up like a butterfly or a bee doesansw2. Actually small birds DO pollinate flowers. there are a class of birds called 'honey eaters' (Meliphagidae) and in New Zealand the waxeye (a.k.a. silver eye) pollinates the peach trees in my garden. I've seen a flock of them busy on their task. And we have a bird called a Tui, about the size of a thrush, and these feed on several nectar trees, and on the flowers of flax.And though I've never seem a hummingbird, these are honey eaters as well i understand.
What is advantages of a plant producing so much pollen?
Pollen protects the gametes from environmental dangers and allows the gametes to travel without water. This in turn allows the gametes to travel longer distances and to more diverse environments
